Make a rotations-only parent BGE
This method is not exactly what i looking for, but it do his work:

import bge


def main():

    cont = bge.logic.getCurrentController()
    own = cont.owner
    scene = bge.logic.getCurrentScene()

    rot = scene.objects ["Rotation"]

    own.worldOrientation = rot.worldOrientation


This script get the rotation from Object "rot" an set it to "own".

Location doesnt affect "own".

You can also replace this line:

own.worldOrientation = rot.worldOrientation


With this:

own.worldPosition = rot.worldPosition


for doing the same, but with the Location.

Both two works in real time in the BGE.